I had a situation very similar to this when I first signed up to FFXIV. Here are the facts.

You have one SE account and two PSN accounts. When you first start playing FFXIV the game confirms if you're 100% certain that you want to bind that SE account to that PSN account. Your SE account is forever affixed to your first PSN account. There's no way to disassociate the two and you can't ever use that SE account on any other PSN account.

Your SE account and first PSN account are now mutually exclusive with each other. Sorry to let you know.

I tried for literally DAYS to get this sort of thing reversed but you can't. It's not a SE thing, Sony is the reason that they're bound together and they can't (or won't) undo it.

If you call Sony and ask them to reverse the purchase you made on the second account they'll jerk you around for hours and try to tell you that they can't or aren't allowed to but they can. They refunded me for my second purchase, after hours of waiting and explaining.